You’re transitioning. Your body is equipped to process a high intake of carbs and a lower intake of fat. Your body needs to create enzymes to be able to do this. In the transitional period, the brain may run low on energy which can lead to grogginess, nausea, and headaches. If you’re having a large problem with this, you can choose to reduce carb intake gradually.
Food is your body’s primary source of energy, and three main nutrients in foods supply your body with this energy. These are carbohydrates, fat, and protein. Typically after eating a meal, your body will first break down carbohydrates from foods, and then fat and protein.Ketosis is a natural metabolic state that occurs when your body doesn’t have enoughcarbs (or glucose) for energy, so it burns fat instead.

Hi Ben – Great article. I had trouble at the end figuring out if you were now eating high fat (60-80% of calories), or if you went back to something closer to 50% fat calories and higher carbs and are using exogenous ketones to get int ketosis when needed. Are you doing any carbs at night or a refeed, or just having higher carbs on most days? Thanks
Now, there a few things you should know before you begin using KETO//OS. First, ketones naturally act as a diuretic, so you lose salt, potassium, calcium and magnesium, and it is generally encouraged to increase sodium intake with ketones. That’s why there is extra sodium added to KETO//OS. The combination of BHB with sodium also acts as a bit of a buffer to buffer natural ketone acidity.
Putting — and then keeping — your body in ketosis isn’t exactly easy. You’ll need to severely minimize your intake of carbohydrates, eating no more than 20 to 50 grams (g) of carbs per day to get there and stay there. A single medium pear, for example, contains 26 g of carbs, and even foods that aren’t generally considered high in carbs — such as nuts and nonstarchy veggies — contain a small amount of carbohydrates, and so will need to be limited or avoided on this plan.
Hi Gigi, Low carb and keto is about the balance of macronutrients eaten (fat, protein and carbs), not specifically meat or lack thereof. Most people on keto do eat meat, though some people do vegetarian keto. Fat is actually necessary for many body processes. There is no issue for the kidneys with a high fat diet, but if you eat too much protein that isn’t great for the kidneys. It’s a common misconception that keto is high protein (it isn’t). Keto is great for diabetics as it naturally helps stabilize insulin. All of this being said, please know I’m not a doctor and you should consult your doctor on any medical questions or before starting any diet. If you have more questions that aren’t medical questions, I recommend our low carb & keto support group here.
To understand exogenous ketones, you should know that there are three types of ketones: beta-hydroxybutyrate (BHB), acetoacetate (ACA) and acetone, and all three are the normal by-products of fat breakdown by your body. In much the same way as glucose, ketones can be used by your tissues, especially your brain, diaphragm and heart and are actually a far more efficient fuel source than glucose.
Watermelon is a staple summer fruit and another low-carb way to help satisfy your sweet tooth on keto. Each ½ cup of diced watermelon has 5.4 g of net carbs. It’s also an acceptable choice when dieting because of its high water content. The ½ cup serving size of watermelon has about 23 calories and 4.7 g of sugar. This juicy fruit also offers 432 IU of vitamin A, which is 8.6 percent of the DV.
On the ketogenic diet I feel very shaky/anxious from when I wake up til about noon. Eating doesn’t really help. It could be electrolyte related but seems possibly more related to excess cortisol/adrenaline as noon is also when I start to crash and get tired on a more normal diet, and because those 3 am awakenings that worsen simultaneously in ketosis seem to also have to do with HPA axis stuff. Does this side effect potentially also have to do with my fasting blood sugar being elevated?
The same goes for people with type 2 diabetes. While some preliminary research suggests the keto diet may be safe and effective for certain people with type 2 diabetes, there’s still the risk for low blood sugar, especially for those on insulin, and the keto diet omits certain food groups known to benefit those with this disease. For example, a study published in September 2016 in the journal Nutrients highlights the importance of whole grains for helping to control weight as well as episodes of high blood sugar. Whole grains are off-limits on the ketogenic diet.
Acetyl-CoA can be metabolized through the TCA in any cell, but it can also undergo a different process in liver cells: ketogenesis, which produces ketone bodies.[27] Ketone bodies are also produced in mitochondria, and usually occur in response to low blood glucose levels.[28] When glucose levels are low, oxaloacetate is diverted away from the TCA cycle and is instead used to produce glucose de novo (gluconeogenesis). But when oxaloacetate is unavailable to condense with acetyl-CoA, acetyl-CoA cannot enter the cycle, and so the body has evolved an alternative way to harvest energy from it.
The nerve impulse is characterised by a great influx of sodium ions through channels in the neuron's cell membrane followed by an efflux of potassium ions through other channels. The neuron is unable to fire again for a short time (known as the refractory period), which is mediated by another potassium channel. The flow through these ion channels is governed by a "gate" which is opened by either a voltage change or a chemical messenger known as a ligand (such as a neurotransmitter). These channels are another target for anticonvulsant drugs.[7]
That’s right: it turns out that if I could go back and do my year of strict ketosis again, I would do everything you’ve going to discover below. If I had done that, I would have avoided all the uncomfortable, unhealthy issues I experienced when I was eating a high-fat diet, and I would have gotten all the benefits with none of the harm. As a matter of fact, in the past 30 days, as I’ve begun a new journey into ketosis, I am now implementing the exact four methods you’re about to discover.
I've tried that before(enzymedica digest gold for example) but it didn't seem to help much. It seems from testing that I have some heavy metal stuff going on and there might have been a chronic mold exposure in the past that is still reeking havoc and I imagine that might be affecting this pretty heavily. I will definitely be sticking to the avocadoes and coconut and 100% dark chocolate because I can't tolerate dairy. The hard part is figuring out what is the bare minimum of starch to make my gut feel good and be regular and at the same time become fat adapted and get those increased cognition and longevity benefits!!
I talk about that quite a bit here :https://bengreenfieldfitness.com/2015/09/things-your-pee-can-tell-you-about-your-body/
The first modern study of fasting as a treatment for epilepsy was in France in 1911.[12] Twenty epilepsy patients of all ages were "detoxified" by consuming a low-calorie vegetarian diet, combined with periods of fasting and purging. Two benefited enormously, but most failed to maintain compliance with the imposed restrictions. The diet improved the patients' mental capabilities, in contrast to their medication, potassium bromide, which dulled the mind.[13]

Some clinicians[37] regard eliminating carbohydrates as unhealthy and dangerous.[38] However, it is not necessary to eliminate carbohydrates from the diet completely to achieve ketosis. Other clinicians regard ketosis as a safe biochemical process that occurs during the fat-burning state.[35] Ketosis, which is accompanied by gluconeogenesis (the creation of glucose de novo from pyruvate), is the specific state that concerns some clinicians. However, it is unlikely for a normally functioning person to reach life-threatening levels of ketosis, defined as serum beta-hydroxybutyrate (B-OHB) levels above 15 millimolar (mM) compared to ketogenic diets among non diabetics, which "rarely run serum B-OHB levels above 3 mM."[39] This is avoided with proper basal secretion of pancreatic insulin. People who are unable to secrete basal insulin, such as type 1 diabetics and long-term type II diabetics, are liable to enter an unsafe level of ketosis, eventually resulting in a coma that requires emergency medical treatment.[citation needed] The anti-ketosis conclusions have been challenged by a number of doctors and advocates of low-carbohydrate diets, who dispute assertions that the body has a preference for glucose and that there are dangers associated with ketosis.[40][41]


Amazing article – gonna have to print it and read it again. To much to break down in one sitting. Thanks Ben – you’ve pulled together so much insight and references that’s given me greater confidence and conviction. I’m 50 and use to be super active and a seasoned athlete but after a few ‘mid life surgical interventions’ I had to find a better way… Ketogenics has been that for me… no more inflammation… I can’t tell you how great it’s been to be pain free! Keep leading from the front.
The ketogenic diet is a mainstream dietary therapy that was developed to reproduce the success and remove the limitations of the non-mainstream use of fasting to treat epilepsy.[Note 2] Although popular in the 1920s and '30s, it was largely abandoned in favour of new anticonvulsant drugs.[1] Most individuals with epilepsy can successfully control their seizures with medication. However, 20–30% fail to achieve such control despite trying a number of different drugs.[9] For this group, and for children in particular, the diet has once again found a role in epilepsy management.[1][10]

When you burn key tones as a funeral, whether they are from a supplement or whether they are the ones that your body makes, you do indeed become more efficient utilizing ketones. So that is one advantage. You are correct in that if you simply use these and you do not restrict carbohydrate intake then you're not going to get quite as much benefit. I am a fan of combining these with intermittent fasting, MCT oil, and a high-fat diet.


1. If a set number ketones in the blood is an indicator that my body has transitioned to ketosis and not necessarily the cause (the cause being limited access to glycogen because of limited carb intake) then how does using exogenous ketones put me in ketosis as opposed to mimic being in ketosis (because when measuring blood ketones suddenly there are more because I put them there, I didn’t create them)?
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